Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f71026397d91b2…

MALICIOUS

PDF

103.0 KB Created: 2021-07-23 13:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40b0e1dbc1208857dba1ebd8337a8ca6 SHA-1: cacb5569825189c7f104fd4ed1195d479f0eab8b SHA-256: d0f71026397d91b29d979bd1f8b062ef0f075e5bcf98113ba786aa3a4b25e306
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The presence of numerous links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9809

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mkycc4.com/kycc4.com/userfiles/files/96580895038.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b185d80254c---5343992717.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/64ac1ba557094df66b4deff0e7d60454/wotasinajexuma.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607970b302633---99721632786.pdf
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/tusipopuf.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a839a840878---58294024023.pdf
    • https://angelsforwarriors.org/userfiles/files/bixabinidilarudekoxaz.pdf
    • http://maasmartcity.com/userfiles/file/xixapimawonid.pdf
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/13983578278.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baff2961ca0---voniralerozabijulakejo.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/3baj1oedq00di9h1mminq5qst0/96252671733.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e4bb7d3b30ad1b4420b684f720a4ebf2/zuguluxirites.pdf
    • http://www.climatisur.com/ckfinder/userfiles/files/45580514013.pdf
    • https://annjulieskarpmo.com/userfiles/file/kimalufozemurifizoxilaxo.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/4854363832.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6fc3a56bd---63666275636.pdf
    • https://joebalogh.ro/imagini_ws/10543064059.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/262b457d92c379eb8618d5992ff27487/vovifidax.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/751fcd5032d00cfbb0ce3be801dfc282/4136432984.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/58e73654914f85402774f827be171208/61177220187.pdf
    • http://furniture83.com/upload/files/mipokudesalosipodimuwat.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/1bb65617f1094629d74558c1f33ba674/6754153222.pdf
    • http://naturalmis.com/userfiles/file/28800470917.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=aikatsu+photo+on+stage+apkpure
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d296.bin
4943477310d63c331f240445167f1dd19753e8d2734573f2c30448c0ea08d273
pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 10660 bytes
font_01_sfnt_off0000eb03.bin
d0255ec6f3ad8c6269dcb0205c038154682fea90b6eaedd32cb41e2fdefb8b23
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 17292 bytes
font_02_sfnt_off0001031d.bin
0b9d9997dd9779f5211c227ea44d2f5b28386fa34929b93274a7afb116600371
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 18360 bytes
font_03_sfnt_off0001331a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1331A 16792 bytes
font_04_sfnt_off00014b28.bin
bfa48b092231ebf138cc85394724afd432ed393ae219cbd53401c8bcc8bf64b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B28 23264 bytes